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Code Ape Tech Column

Former Ant Group P8 engineer, pure technologist, sharing full‑stack Java, job interview and career advice through a column. Site: java-family.cn

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Latest from Code Ape Tech Column

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Code Ape Tech Column

Jan 26, 2026 · Backend Development

Prevent Duplicate Spring @Scheduled Jobs in Multi‑Instance Deployments with ShedLock

When a Spring Boot application using @Scheduled is deployed on multiple servers, each instance triggers the same job, leading to duplicate processing; this article explains why the problem occurs, reviews simple single‑node and Redis lock approaches, and provides a step‑by‑step guide to integrate the ShedLock framework for reliable, annotation‑driven distributed locking.

@ScheduledJavaShedLock

0 likes · 8 min read

Prevent Duplicate Spring @Scheduled Jobs in Multi‑Instance Deployments with ShedLock

Code Ape Tech Column

Jan 21, 2026 · Backend Development

Mastering Dynamic Permission Checks in Spring Boot with Custom Annotations and SpEL

This article explains how to replace static permission annotations in Spring Boot with flexible SpEL expressions, showing step‑by‑step how to create a @PreAuth annotation, an AOP aspect, an expression parser, and a utility class that evaluates role‑ and time‑based access rules at runtime.

AOPCustom AnnotationSpEL

0 likes · 10 min read

Mastering Dynamic Permission Checks in Spring Boot with Custom Annotations and SpEL

Code Ape Tech Column

Jan 16, 2026 · Backend Development

Master JSONPath in Spring Boot: Simplify Complex JSON Extraction

JSONPath offers a concise, XPath‑like syntax for extracting data from complex JSON structures, and this guide shows how to integrate it into Spring Boot, compare FastJSON, Jackson, and Gson implementations, and provides practical code examples, advanced configurations, and selection advice for Java projects.

FastJSONGsonJackson

0 likes · 13 min read

Master JSONPath in Spring Boot: Simplify Complex JSON Extraction

Code Ape Tech Column

Jan 13, 2026 · Operations

Boost SpringBoot Production Management with a Visual Service Script

This article introduces a powerful visual service‑management script for SpringBoot applications that replaces manual start‑stop commands with an interactive, color‑coded console, offering configuration‑driven control, intelligent start/stop flows, real‑time monitoring, log handling, batch operations, automated deployment and safe rollback to dramatically improve operational efficiency and reliability.

BashService ManagementSpringBoot

0 likes · 22 min read

Boost SpringBoot Production Management with a Visual Service Script

Code Ape Tech Column

Jan 7, 2026 · Operations

Is Syslog Still the Best Choice for Simple, Low‑Cost Log Collection?

This article explains why the decades‑old Syslog protocol remains relevant in modern microservice and cloud‑native environments, detailing its structure, advantages, typical use cases, step‑by‑step server setup with rsyslog, command‑line analysis techniques, integration with Java applications, and a comparison with ELK/Loki solutions.

log analysislog collectionrsyslog

0 likes · 20 min read

Is Syslog Still the Best Choice for Simple, Low‑Cost Log Collection?

Code Ape Tech Column

Jan 4, 2026 · Backend Development

Migrating SpringBoot MyBatisPlus from MySQL to PostgreSQL: Common Pitfalls & Fixes

This guide walks through switching a SpringBoot + MyBatisPlus project from MySQL to PostgreSQL, covering driver setup, JDBC changes, numerous SQL syntax differences, type conversion issues, transaction handling, and provides helper scripts for bulk schema adjustments.

Backend DevelopmentMySQLPostgreSQL

0 likes · 12 min read

Migrating SpringBoot MyBatisPlus from MySQL to PostgreSQL: Common Pitfalls & Fixes

Code Ape Tech Column

Dec 24, 2025 · Backend Development

Master Multi-Method Login in Spring Boot with Strategy & Factory Patterns

This guide walks you through designing a scalable login module that supports dozens of authentication methods by combining the Strategy and Factory patterns with Spring Boot, providing clean code, easy extensibility, and robust testing without the tangled if‑else spaghetti.

Design PatternsFactory PatternJava

0 likes · 12 min read

Master Multi-Method Login in Spring Boot with Strategy & Factory Patterns

Code Ape Tech Column

Dec 22, 2025 · Databases

How to Diagnose and Fix 900% CPU Spikes in MySQL and Java Processes

This guide explains why MySQL or Java services can suddenly consume 900% CPU, outlines step‑by‑step diagnostics using Linux tools, and provides concrete optimization actions such as killing offending queries, adding indexes, tuning caches, and fixing Java thread loops.

CPUJavaLinux

0 likes · 12 min read

How to Diagnose and Fix 900% CPU Spikes in MySQL and Java Processes

Code Ape Tech Column

Dec 19, 2025 · Backend Development

Boost SpringBoot Log Management: Step‑by‑Step Integration with Hera

This article explains why traditional SpringBoot logging falls short, introduces the Hera log platform’s three core benefits, outlines a layered integration architecture, and provides a detailed five‑step guide—including Maven dependencies, YAML configuration, custom field providers, log output, traceability, and console usage—plus performance, high‑availability, security tips and common pitfalls.

Distributed SystemsHeraLog Management

0 likes · 14 min read

Boost SpringBoot Log Management: Step‑by‑Step Integration with Hera

Code Ape Tech Column

Dec 18, 2025 · Backend Development

How to Co‑exist Multiple DataSources in Spring Without Switching?

This guide explains the concept of multi‑DataSource coexistence, when it is appropriate, step‑by‑step configuration for MySQL and TDengine, transaction manager handling, custom annotations, mapper scanning, differences from dynamic routing, common pitfalls, and best‑practice usage in a Spring‑MyBatis backend.

JavaMulti-DataSourceMyBatis

0 likes · 13 min read

How to Co‑exist Multiple DataSources in Spring Without Switching?